SOLAR PANEL
100kW
Best for larger-sized businesses
$39,999*
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100kW Solar System
A 100kW solar system is a large-scale energy setup that’s perfectly suited for medium to large businesses, schools, warehouses, shopping centres, or even community facilities that have high energy demands. In Australia, systems of this size can make a huge difference to electricity bills, often cutting them down by a significant margin each month. Over time, that means real, long-term savings that keep adding up year after year.
Beyond the cost benefits, a lot of Aussie businesses are turning to 100kW systems to meet sustainability targets, reduce their carbon footprint, and show customers they care about the environment. Plus, with energy prices constantly on the rise, having your own renewable power source provides a layer of protection against future cost hikes — a smart move for any organisation thinking ahead.
$39,999
Installed price (after STC rebate)
286–452
1.5–3 yrs
$650k+
What Is a 100kW Solar System?
A 100kW solar system is the largest-scale solar installation available under the federal Small-scale Technology Certificate (STC) rebate scheme. It represents the upper boundary of the commercial solar tier — generating 286 to 452 kWh of electricity per day depending on location — enough to substantially power a large warehouse, shopping centre, hospital, university building, or major industrial facility during operating hours.
A fully installed 100kW system from Aussie Solar Tech includes 182–263 Tier 1 solar panels, one or more premium commercial-grade three-phase inverters, heavy-duty commercial roof-mounting or ground-mount structures, a dedicated protection system (AS 4777 compliant), commercial-grade monitoring with interval data logging, and a complete DNSP application process managed by our registered electrical engineers.
100kW: The STC scheme boundary — critical for your rebate
Systems of exactly 100kW capacity or less are eligible for the STC upfront rebate — worth approximately $28,000–$40,000 at this size. Systems above 100kW move to the LGC scheme (ongoing revenue per MWh generated, no upfront rebate). If your business could use 99kW or 101kW, the distinction matters significantly for your financial model. Aussie Solar Tech’s engineers will advise on the optimal system capacity during your free business case consultation.
STC vs LGC: Which Scheme Applies at 100kW?
This is the most important regulatory question for any business considering a system at or near 100kW. The two federal government incentive schemes work very differently and the right answer for your business depends on system size, usage profile, and whether you want upfront capital reduction or ongoing revenue.
Can you split a large system into two ≤100kW systems?
In some cases, a business requiring 150–200kW can install two separate 100kW systems on different meters or connection points, each claiming STCs independently. However, this must be genuinely separate systems and connection points — the Clean Energy Regulator monitors for system splitting to circumvent the LGC threshold. Our commercial team will advise on whether this approach is viable and compliant for your specific premises.
Discover The Best Solar Panel System For Your Home And Business
40KW
Solar System
Best for large shops and clinics
$
16,599
*
Big Family Home
- Tier 1 Solar Module
- 30kW Power Inverter
- 30,000w Tier 1 Panels
- High Efficiency Solar Module
50KW
Solar System
warehouses and mid-size business
$
19,599
*
Medium Industrial
- Tier 1 Solar Module
- 40kW Power Inverter
- 40,000w Tier 1 Panels
- High Efficiency Solar Module
100KW
Solar System
Best for larger-sized businesses
$
39,999
*
Huge Commercial
- Tier 1 Solar Module
- 50kW Power Inverter
- 50,000w Tier 1 Panels
- High Efficiency Solar Module
10KW
Solar System
Just right for most family homes
$
5,999
*
Small Home
- Tier 1 Solar Module
- 5kW Power Inverter
- 6,600w Tier 1 Panels
- High Efficiency Solar Module
13KW
Solar System
Medium homes and small business
$
7,599
*
Medium Home
- Tier 1 Solar Module
- 8kW Power Inverter
- 10,300w Tier 1 Panels
- High Efficiency Solar Module
20KW
Solar System
Larger homes and small businesses
$
10,299
*
Big Family Home
- Tier 1 Solar Module
- 10kW Power Inverter
- 13,200w Tier 1 Panels
- High Efficiency Solar Module
*Performance data is based on CEC guidelines and may differ depending on your location. For personalized advice on your solar requirements and potential savings, please consult with an Aussie Solar Installation expert.
Who Needs a 100kW System? Business Types & Use Cases
A 100kW system delivers maximum value for large businesses with consistent, high daytime energy consumption — typically 300–500 kWh per day or more during operating hours. At this scale, electricity bills are large enough that even modest percentage reductions translate into substantial dollar savings, and the economics of a well-designed system become extremely compelling.
Panels & Roof / Ground Space Required
Panel Count & Space Requirements
| Panel Wattage | Panels Required | Roof Area (pitched) | Roof Area (flat + tilt frame) |
|---|---|---|---|
| 400W | 250 panels | ~425 m² | ~550 m² |
| 420W | 238 panels | ~405 m² | ~525 m² |
| 450W | 223 panels | ~379 m² | ~490 m² |
| 500W | 200 panels | ~340 m² | ~440 m² |
| 550W+ | 182 panels | ~309 m² | ~400 m² |
*Pitched roof area includes 300mm inter-panel clearances and perimeter setbacks per AS/NZS 5033. Flat roof with tilt frames adds 30–35% additional space for inter-row shading avoidance at 10°–15° tilt. Ground-mount systems require additional space for access tracks, fencing, and cable trenching.
Ground-Mount Option
If your property lacks sufficient roof area, a ground-mounted 100kW system is a viable alternative — particularly for industrial properties, farms, and rural commercial sites. Ground-mount systems allow optimal north-facing orientation at the ideal tilt angle regardless of roof orientation, often delivering 5–10% more annual output than compromised roof installations. Aussie Solar Tech designs and installs ground-mount systems with hot-dip galvanised steel racking structures engineered for Australian wind load conditions.
100kW Solar System Cost in Australia
Aussie Solar Tech’s fully installed price for a 100kW commercial solar system starts from $39,999 (ex GST, after STC rebate). The table below compares our pricing against market averages across capital cities, giving you a clear picture of what a competitive installed price looks like at this system size.
What's included in our $39,999 price?
Tier 1 commercial panels (CEC approved) · Two premium 50kW three-phase inverters · SAA-accredited commercial installation · Heavy-duty commercial mounting hardware · Protection relay & AS 4777 compliance · Engineer-certified single-line diagram · Commercial monitoring with interval logging · DNSP application fully managed · STC registration and paperwork handled · Standard flat or pitched commercial roof.
| City | Aussie Solar Tech | Market Average (Apr 2025) | Your Saving |
|---|---|---|---|
| Sydney, NSW | $39,999 | $84,000 | ~$44,001 |
| Melbourne, VIC | $39,999 | $80,500 | ~$40,501 |
| Brisbane, QLD | $39,999 | $92,000 | ~$52,001 |
| Adelaide, SA | $39,999 | $91,500 | ~$51,501 |
| Perth, WA | $39,999 | $89,200 | ~$49,201 |
| Canberra, ACT | $39,999 | $100,800 | ~$60,801 |
| Hobart, TAS | $39,999 | $95,200 | ~$55,201 |
*Market average figures estimated from Solar Choice Commercial Price Index scaled to 100kW (Feb 2026 index × April 2025 adjustment), ex GST. Final Aussie Solar Tech pricing may vary for complex buildings, ground-mount systems, high crane-access requirements, protection relay type, metering upgrades, extended cable runs, and premium panel/inverter selections.
Additional Costs to Budget For at 100kW
| Item | Typical Cost Range | When Required |
|---|---|---|
| Protection relay (dedicated) | $3,000–$8,000 | Required by most DNSPs at 100kW |
| Engineer-certified SLD & protection report | $2,000–$5,000 | Required by all DNSPs at 100kW |
| Tilt frames (flat commercial roof) | $8,000–$15,000 | All flat commercial roofs |
| Main switchboard upgrade | $2,000–$8,000 | Undersized or outdated board |
| DNSP application / connection fee | $800–$3,000 | All states |
| Interval metering upgrade | $500–$2,000 | If not already installed |
| Crane hire (multi-storey) | $2,000–$8,000 | Multi-storey or difficult access |
| Ground-mount civil works | $8,000–$25,000 | Ground-mounted systems |
| Commercial battery storage | $50,000–$150,000+ | Optional — for demand management |
Quick Summary: 100kW Solar System Price Australia 2026
– Base installed price: $39,999 (after STC rebates)
– Market average across capital cities: $78,000–$98,000
– Your saving with Aussie Solar Tech: Up to $59,000
– Payback period: 1.8–3.5 years (business use)
– Estimated 25-year savings: $620,000+
– STC rebate value: $25,000–$36,000 (pre-applied)
Daily Energy Output by City — BOM Data
Output figures are modelled using Bureau of Meteorology (BOM) solar irradiance data and PVWatts v8, assuming a north-facing array at 15°–20° tilt, and 77% system efficiency. These are conservative annual averages — summer output is 20–40% higher, winter 20–40% lower.
| City | Peak Sun Hours/Day | Avg Daily Output | Annual Output | Data Source |
|---|---|---|---|---|
| Darwin, NT | 5.5 hrs | 393–452 kWh/day | ~156,220 kWh/yr | BOM/PVWatts v8 |
| Brisbane, QLD | 5.0 hrs | 360–406 kWh/day | ~140,900 kWh/yr | BOM/PVWatts v8 |
| Perth, WA | 4.9 hrs | 382–436 kWh/day | ~149,700 kWh/yr | BOM/PVWatts v8 |
| Adelaide, SA | 4.8 hrs | 362–408 kWh/day | ~140,900 kWh/yr | BOM/PVWatts v8 |
| Canberra, ACT | 4.6 hrs | 360–412 kWh/day | ~140,900 kWh/yr | BOM/PVWatts v8 |
| Sydney, NSW | 4.6 hrs | 340–378 kWh/day | ~131,400 kWh/yr | BOM/PVWatts v8 |
| Melbourne, VIC | 4.2 hrs | 314–360 kWh/day | ~122,285 kWh/yr | BOM/PVWatts v8 |
| Hobart, TAS | 3.8 hrs | 286–330 kWh/day | ~113,150 kWh/yr | BOM/PVWatts v8 |
*Assumes north-facing at 15°–20° tilt, 77% system efficiency, no shading. Based on BOM solar irradiance data and PVWatts v8. Actual output varies with soiling (~2–3%/yr), temperature losses (~10–15% in peak summer), inverter efficiency, and panel degradation (~0.5%/yr).
Demand Charge Savings — The Hidden Benefit
This section is unique to large commercial systems and is almost never covered by generic solar guides — yet for many businesses it represents a significant portion of total solar savings that doesn’t appear in a simple electricity-rate payback calculation.
Many large Australian businesses are on commercial electricity tariffs that include a demand charge component — a fee charged per kW of peak demand recorded in your highest 15–30 minute interval each month. Demand charges can represent 20–40% of a large business’s total electricity bill, yet they are billed based on just a few peak moments per month.
100kW: The STC scheme boundary — critical for your rebate
Tier 1 commercial panels (CEC approved) · Two premium 50kW three-phase inverters · SAA-accredited commercial installation · Heavy-duty commercial mounting hardware · Protection relay & AS 4777 compliance · Engineer-certified single-line diagram · Commercial monitoring with interval logging · DNSP application fully managed · STC registration and paperwork handled · Standard flat or pitched commercial roof.
How Solar Reduces Demand Charges
Solar offsets peak daytime consumption directly
During business hours when peak demand events most commonly occur, your 100kW solar array reduces the amount of power drawn from the grid — lowering your recorded kW demand for that interval.
Demand events outside solar hours (early morning starts, evening shifts) can be addressed by commercial battery storage configured for demand response — charging during low-demand periods and discharging during peak intervals to cap recorded demand.
Our commercial monitoring systems identify when peak intervals are likely to be set and can trigger alerts to defer non-essential loads (HVAC pre-cooling, EV charging, compressor cycles) during those windows.
Payback Period & ROI by City
The payback table below models returns for a large business consuming 400 kWh per day (typical for a large warehouse, supermarket, or university building) at 70% and 90% self-consumption. These figures include only energy savings — demand charge savings and tax benefits add further value not shown here.
100kW: The STC scheme boundary — critical for your rebate
Tier 1 commercial panels (CEC approved) · Two premium 50kW three-phase inverters · SAA-accredited commercial installation · Heavy-duty commercial mounting hardware · Protection relay & AS 4777 compliance · Engineer-certified single-line diagram · Commercial monitoring with interval logging · DNSP application fully managed · STC registration and paperwork handled · Standard flat or pitched commercial roof.
| City | System Cost | Elec. Rate | Self-Consumption | Annual Energy Savings | Payback (Energy Only) |
|---|---|---|---|---|---|
| Sydney | $39,999 | 28c/kWh | 70% | $19,530 | 2.2 yrs |
| Sydney | $39,999 | 28c/kWh | 90% | $25,110 | 1.7 yrs |
| Brisbane | $39,999 | 25c/kWh | 70% | $17,438 | 2.5 yrs |
| Brisbane | $39,999 | 25c/kWh | 90% | $22,421 | 1.9 yrs |
| Melbourne | $39,999 | 22c/kWh | 70% | $13,860 | 3.0 yrs |
| Melbourne | $39,999 | 22c/kWh | 90% | $17,820 | 2.3 yrs |
| Adelaide | $39,999 | 34c/kWh | 70% | $26,832 | 1.5 yrs |
| Adelaide | $39,999 | 34c/kWh | 90% | $34,496 | 1.2 yrs |
| Perth | $39,999 | 30c/kWh | 70% | $25,410 | 1.6 yrs |
| Perth | $39,999 | 30c/kWh | 90% | $32,671 | 1.3 yrs |
| Canberra | $39,999 | 28c/kWh | 70% | $19,936 | 2.1 yrs |
| Canberra | $39,999 | 28c/kWh | 90% | $25,631 | 1.6 yrs |
*Assumes 400 kWh/day business consumption. Commercial electricity rates based on competitive market offers, April 2025. Energy savings only — demand charge reductions, tax incentives, and LGC/FiT revenue not included. Request a full commercial business case.
Battery Storage for 100kW Systems
At 100kW, commercial battery storage transitions from an ROI enhancer to a strategic business asset. A well-designed battery system enables demand charge management (the highest-value application at this scale), energy arbitrage, resilience against grid outages, and participation in demand response programs that can generate additional revenue.
| Battery Capacity | Primary Application | Best Business Type | Approx. Cost |
|---|---|---|---|
| 50–100kWh | Demand peak shaving (solar hours) | Offices, retail, schools with daytime peaks | $40,000–$75,000 |
| 100–200kWh | Demand management + evening coverage | Warehouses, large retail, manufacturing | $70,000–$150,000 |
| 200–500kWh | Full demand management + arbitrage | Hospitals, hotels, 24/7 operations | $140,000–$350,000 |
| 500kWh+ | Microgrid / energy independence | Critical facilities, remote industrial | $350,000+ |
Frequently Asked Questions
How much does a 100kW solar system cost in Australia?
How much energy does a 100kW solar system produce per day?
What is the payback period for a 100kW solar system?
How many panels does a 100kW solar system need?
Why Choose Aussie Solar Installation For Solar Panels?
Reduced Electricity Bills
Prices for electricity in Australia keep going up. With a combination of a commercial solar system and your business, you can make your own power, which will save you a lot of money on your monthly bills. Many of our customers say they save up to 70% on their monthly utility costs.
Premium Products, Guaranteed Performance
We install top-tier solar panels, inverters, and battery systems from leading global brands. Our products are built to withstand Australian weather and deliver long-lasting performance, backed by comprehensive warranties.
Brand Image and Sustainability
Going solar not only saves you money, but it also makes your brand look better when it addresses the environment. Customers, along with additional stakeholders like businesses that want to use less energy and migrate to clean energy.
Energy Independence & Stability
Solar energy makes you less reliant on the grid, which protects your business from unexpected blackouts and rate hikes, making sure that everything runs smoothly all the time.
Expert Local Installers
We are Standards Australia Approvals (SAA)-certified, and in-house installation teams work across New South Wales. With years of local experience, we handle everything—from permits and grid connections to final inspection—with professionalism and care
Unmatched 24/7 Support
As a comprehensive solar provider, we offer continuous help, support, and maintenance throughout the entire lifespan of your system.
We Install CEC Approved Popular Solar Panels In Australia
We install CEC-approved solar panels from trusted brands including SunPower, REC, AIKO, Canadian Solar, Trina Solar, LONGi Solar, Jinko Solar, and JA Solar.
These brands are chosen for their performance, reliability, and suitability for Australian conditions.
